CN113099389B

CN113099389B - Method and system for independently deployed 5G system to bear MBMS

Info

Publication number: CN113099389B
Application number: CN202010021599.2A
Authority: CN
Inventors: 魏立梅; 袁乃华; 陈迎; 范晨
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2022-06-24
Anticipated expiration: 2040-01-09
Also published as: CN113099389A

Abstract

The embodiment of the invention provides a method and a system for bearing an MBMS (multimedia broadcast multicast service) by an independently deployed 5G system. 5GC receiving an MBMS session start request from the MBMS-GW; the MCE receives an MBMS session starting request from the 5GC and determines a cell which needs to broadcast the MBMS and belongs to the gNB; the MCE determines a broadcast mode of broadcasting the MBMS in a cell belonging to the gNB; the gNB receives MBMS configuration information corresponding to a broadcast mode from the MCE and receives MBMS data from the MBMS-GW based on the MBMS configuration information; and the gNB broadcasts the MBMS data in the cell belonging to the gNB based on the broadcasting mode. The embodiment of the invention realizes that the MBMS is broadcast in the gNB through the 5GC in the independently deployed scene by MBMS load.

Description

Method and system for independently deployed 5G system to bear MBMS

Technical Field

The present invention belongs to the technical field of mobile communication, and particularly relates to a method and a system for an independently deployed 5G system to carry Multimedia Broadcast Multicast Service (MBMS).

Background

MBMS is a typical service supported by the LTE system in 3GPP protocol, and the service can be transmitted to a specific User Equipment (UE) through a unicast Bearer, and can also be broadcast in a cell through an MBMS Bearer (MBMS Bearer). Fig. 1 is an architecture diagram of MBMS in LTE system in 3GPP protocol. The PLMN is a home PLMN (H-PLMN) when the UE is in a non-roaming scenario; when the UE is in a roaming scenario, the PLMN is a visited PLMN (V-PLMN). The E-UTRAN consists of a multi-cell Multicast Coordination Entity (MCE) and an evolved base station (eNB).

Taking fig. 1 as an example, the procedure of broadcasting MBMS by MBMS bearer is as follows:

a Group communication system application server (GCS AS) in an application domain sends an MBMS Bearer activation Request (active MBMS Bearer Request) to a BM-SC through an MB2-C interface, and the message carries a session attribute of the MBMS. The session attributes include: TMGI, QOS information, MBMS broadcast area and start time of MBMS, wherein the MBMS broadcast area is defined by an MBMS service area ID list and/or a cell ID list. The message triggers BM-SC to initiate a session start request process, in which BM-SC triggers a corresponding network element to allocate resources for MBMS bearer.

Specifically, in the Session Start Request process, the BM-SC sends a Session Start Request (Session Start Request) to the MBMS-GW, where the message carries the Session attribute of the MBMS. MBMS-GW establishes MBMS bearing context for MBMS and distributes transmission network IP multicast address and C-TEID for the service. MBMS-GW sends session start request to corresponding MME, and the message carries session attribute. Newly adding: the TNL information. The information includes: the transport network IP multicast address, the C-TEID and the IP address of the multicast source. Before sending this message, the MBMS-GW feeds back a Session Start Response) to the BM-SC.

After receiving the Response, the BM-SC feeds back an Activate MBMS Bearer Response (Activate MBMS Bearer Response) to the GCS AS. The message carries the information of the IP address, the port number and the like of the BM-SC. The BM-SC is then ready to receive MBME traffic data from the GCS AS over the MB2-U interface.

The GCS AS, after receiving the activate MBMS bearer response, will prepare to send MBMS data to the BM-SC over the MB2-U interface.

After receiving the MBMS conversation starting request, the MME establishes an MBMS bearing context for the MBMS according to the conversation attribute in the message, determines each MCE corresponding to the MBMS broadcast area in the conversation attribute, and sends the conversation starting request to each MCE. The message carries the session attributes.

The MCE establishes MBMS bearing context for the MBMS according to the session attribute of the MBMS in the message and determines the MBMS sending mode of each service area or cell corresponding to the MBMS broadcast area.

When the MCE determines that the service is broadcasted in an MBMS area or an area formed by a plurality of cells in an MBSFN mode, the MCE allocates radio resources to the MBMS.

The MCE sends a session start request to the corresponding eNB. The message carries MBMS session attributes. The session attributes include: TMGI and TNL information, etc. When the MCE determines to transmit the MBMS in the corresponding cell in an SC-PTM mode, the message also carries SC-PTM information, and the information comprises: QOS information of MBMS and a cell ID list, wherein the cell ID list is a set of cells which transmit MBMS in an SC-PTM mode in the cells belonging to the corresponding eNB.

After receiving the session start request, the eNB joins the corresponding IP multicast distribution through the M1 interface according to the TNL information in the session attributes, and prepares to receive the data of the MBMS from the MBMS-GW.

And when the message contains SC-PTM information, the eNB allocates wireless resources to the MBMS according to the QOS information of the MBMS in each cell corresponding to the cell ID list. In general, radio resources allocated to an MBMS by an eNB in different cells are not the same.

When the MCE determines that the service is broadcasted in the MBSFN manner in one MBMS area or an area formed by several cells, the MCE also sends MBMS Scheduling information (MBMS Scheduling information) to the corresponding eNB. The message includes MBSFN area configuration information. The eNB can determine the configuration information of the control plane resources and the user plane resources required by the MBMS transmission in the MBSFN mode according to the MBSFN area configuration information. And the eNB broadcasts the MBSFN area control information and the MBMS data in a corresponding cell through corresponding control plane resources and user plane resources.

After the MCE receives the session start request sent by the MME, the MCE feeds back a session start response to the MME before or during the processing performed by the MCE and the eNB.

And after receiving the response message fed back by the MCE, the MME feeds back a session start response to the MBMS-GW. The MBMS-GW starts IP multicast distribution of MBMS data after receiving the response.

After the above processing procedure, when the time of MBMS transmission is up, the GCS AS sends MBMS data to BM-SC, BM-SC forwards the data to MBMS-GW, and MBMS-GW sends the data to corresponding eNB in IP multicast distribution mode. In the MBSFN mode, the eNB broadcasts the data of the MBMS in a corresponding cell through the radio resources uniformly distributed by the MCE; in the SC-PTM mode, the eNB broadcasts the data of the MBMS in the corresponding cell through the radio resource allocated by the eNB.

With the widespread use of the LTE system, the era of wireless internet has been opened. Wireless internet has developed more diverse demands for wireless networks, including not only higher system throughput, but also lower transmission delay, higher reliability, and a greater number of connected users. To meet these demands, 5G systems have come into force. The evolution of the LTE system to the 5G system in the 3GPP protocol is divided into two phases: non-independently deployed 5G systems and independently deployed 5G systems. According to the evolution process of the core network, the non-independently deployed 5G system is divided into: 5G systems with enhanced EPC and 5G systems with 5 GC. Fig. 2 is a 5G system architecture diagram of an independent deployment scenario. In the scene, the gNB and the NG-eNB are respectively connected with the 5GC through NG interfaces, the gNB is interconnected through an Xn interface, the gNB is connected with the NG-eNB through an Xn interface, and the NG-eNB is interconnected through an Xn interface. In the above figure, when the UE has the NE-DC function, the UE can be provided with services through the gnbs and the ng-enbs at the same time, and when the UE has the NR-DC function, the UE can be provided with services through the two gnbs at the same time.

However, in the above independently deployed 5G system, there is no related method and system in the industry how to provide MBMS through 5GC and gNB in MBMS bearer.

Disclosure of Invention

The embodiment of the invention provides a method and a system for bearing an MBMS by an independently deployed 5G system.

The technical scheme of the embodiment of the invention is as follows:

a method for bearing MBMS by independently deployed 5G system includes:

5GC receiving an MBMS session start request from the MBMS-GW;

the MCE receives an MBMS session starting request from the 5GC and determines a cell which needs to broadcast the MBMS and belongs to the gNB;

the MCE determines a broadcast mode of broadcasting the MBMS in the cell belonging to the gNB;

the gNB receives MBMS configuration information corresponding to a broadcast mode from the MCE and receives MBMS data from the MBMS-GW based on the MBMS configuration information;

and the gNB broadcasts the MBMS data in the cell belonging to the gNB based on the broadcasting mode.

In one embodiment, the broadcasting method includes:

only a multimedia multicast single frequency network (MBSFN) mode is adopted;

only single cell point-to-multipoint (SC-PTM) mode is adopted;

adopting MBSFN mode or SC-PTM mode.

In one embodiment, the SC-PTM scheme comprises an SC-PTM scheme of mode 1 and an SC-PTM scheme of mode 2, wherein:

in the SC-PTM scheme of scheme 1: in a cell belonging to a gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode;

in the SC-PTM scheme of scheme 2: in a cell belonging to a gNB, the MCE determines a cell ID list broadcasting MBMS in an SC-PTM mode and allocates NR parameters for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID to a current MBMS and determines configuration information of a bandwidth part (BWP) broadcasting the MBMS, wherein the configuration information of the BWP includes: the time-frequency position, the subcarrier interval and the CP type of the BWP of the bandwidth part of the broadcast MBMS, the search space corresponding to a Physical Downlink Control Channel (PDCCH) of the scheduling MBMS and the configuration information of a control resource set.

In one embodiment, when the broadcast mode includes an MBSFN mode, the MBMS configuration information includes: a cell ID list for broadcasting MBMS in MBSFN in a cell belonging to the gNB; wireless resource configuration information uniformly allocated for the MBMS; session attributes of MBMS in an MBMS session start request;

when the broadcast mode includes the SC-PTM mode of the mode 1, the MBMS configuration information includes: a cell ID list for broadcasting MBMS in SC-PTM mode in the cell belonging to the gNB; session attributes of MBMS in an MBMS session start request;

when the broadcast mode comprises the SC-PTM mode of the mode 2, the MBMS configuration information comprises: a cell ID list for broadcasting MBMS in SC-PTM mode in the cell belonging to the gNB; session attributes of MBMS in an MBMS session start request; NR parameters allocated for MBMS, the NR parameters comprising: the MCE allocates a unique group ID for the MBMS; and the MCE determines the configuration information of the BWP broadcasting the MBMS.

In one embodiment, the method further comprises:

5GC receives MBMS conversation updating request from MBMS-GW, and sends the MBMS conversation updating request to MCE; the MCE sends the MBMS session updating request to the gNB;

in the MBSFN mode, the MCE reallocates the radio resources of the MBMS according to the MBMS session update request, and in the SC-PTM mode, the gNB reallocates the radio resources of the MBMS according to the MBMS session update request, wherein: when the wireless resource is successfully reallocated, the gNB continues to receive the MBMS data from the MBMS-GW; when the reallocation of radio resources fails, the gNB stops receiving MBMS data from the MBMS-GW.

In one embodiment, the method further comprises:

5GC receives the MBMS conversation end request from the MBMS-GW and sends the MBMS conversation end request to the MCE; the MCE sends the MBMS session ending request to the gNB;

the MCE releases MBMS bearing context of the MBMS based on the MBMS conversation end request, when the corresponding MBMS adopts MBSFN mode broadcasting, the MCE releases wireless resources occupied by the MBMS conversation and feeds back MBMS conversation end response to the 5 GC; and the gNB releases the wireless resources occupied by the MBMS conversation based on the MBMS conversation ending request, feeds back the MBMS conversation ending requirement to the MCE, and stops receiving the MBMS data from the MBMS-GW.

A system for bearing MBMS by an independently deployed 5G system comprises a 5GC, an MCE and a gNB, wherein:

the 5GC is used for receiving an MBMS session starting request from the MBMS-GW;

the MCE is used for receiving an MBMS session starting request from the 5GC and determining a cell which needs to broadcast the MBMS and belongs to the gNB; determining a broadcast mode for broadcasting the MBMS in the cell belonging to the gNB;

the gNB is used for receiving MBMS configuration information corresponding to a broadcast mode from the MCE and receiving MBMS data from the MBMS-GW based on the MBMS configuration information; and broadcasting the MBMS data in the cell belonging to the gNB based on the broadcasting mode.

In one embodiment, the broadcasting method includes:

only adopting MBSFN mode;

only adopting SC-PTM mode;

adopting MBSFN mode or SC-PTM mode.

In one embodiment, the SC-PTM scheme includes an SC-PTM scheme of scheme 1 and an SC-PTM scheme of scheme 2, wherein:

in the SC-PTM scheme of scheme 2: in a cell belonging to a gNB, the MCE determines a cell ID list broadcasting MBMS in an SC-PTM mode and allocates NR parameters for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a BWP broadcasting the MBMS, wherein the configuration information of the BWP comprises: time-frequency position, subcarrier interval and CP type of bandwidth part BWP of broadcast MBMS, search space corresponding to PDCCH for scheduling MBMS and configuration information of control resource set.

In one embodiment, the 5GC is further configured to receive an MBMS session update request from the MBMS-GW, and send the MBMS session update request to the MCE;

the MCE is also used for sending the MBMS conversation updating request to the gNB and reallocating the radio resources of the MBMS in the MBSFN mode according to the MBMS conversation updating request;

the gNB is further configured to reallocate radio resources of the MBMS according to the MBMS session update request in an SC-PTM manner; wherein: when the wireless resource is successfully reallocated, continuously receiving MBMS data from the MBMS-GW; when the reallocation of radio resources fails, reception of MBMS data from the MBMS-GW is stopped.

In one embodiment, the 5GC is further configured to receive an MBMS session end request from the MBMS-GW, and send the MBMS session end request to the MCE;

the MCE is also used for sending the MBMS conversation ending request to the gNB, releasing the MBMS bearing context of the MBMS based on the MBMS conversation ending request, releasing the radio resources occupied by the MBMS conversation in the MBSFN mode, and feeding back an MBMS conversation ending response to the 5 GC;

and the gNB is also used for releasing the radio resources occupied by the MBMS based on the MBMS session ending request, feeding back an MBMS session ending response to the MCE and stopping receiving the MBMS data from the MBMS-GW.

An apparatus for carrying MBMS in an independently deployed 5G system comprises a processor and a memory;

the memory has stored therein an application executable by the processor for causing the processor to perform a method of MBMS-bearing for a standalone deployed 5G system as described in any of the above.

A computer readable storage medium having stored therein computer readable instructions for performing the method of MBMS-bearing by an independently deployed 5G system as claimed in any one of the preceding claims.

As can be seen from the above technical solutions, in the embodiment of the present invention, a 5GC receives an MBMS session start request from an MBMS-GW; the MCE receives an MBMS session starting request from the 5GC and determines a cell which needs to broadcast the MBMS and belongs to the gNB; the MCE determines a broadcast mode of broadcasting the MBMS in a cell belonging to the gNB; the gNB receives MBMS configuration information corresponding to a broadcast mode from the MCE and receives MBMS data from the MBMS-GW based on the MBMS configuration information; and the gNB broadcasts the MBMS data in the cell belonging to the gNB based on the broadcasting mode. Therefore, the embodiment of the invention can realize that the MBMS is broadcasted on the gNB through the 5GC in the independently deployed scene in the MBMS bearer mode.

Moreover, the specific mode of carrying the MBMS in the embodiment of the invention has various embodiments and can be flexibly applied.

Drawings

Fig. 1 is an architecture diagram of MBMS in LTE system in 3GPP protocol.

Fig. 2 is a 5G system architecture diagram of an independent deployment scenario.

Fig. 3 is a flowchart of a method for carrying MBMS by an independently deployed 5G system according to the present invention.

Fig. 4 is a system structure diagram of the independently deployed 5G system carrying MBMS according to the present invention.

Fig. 5 is a structural diagram of an apparatus for carrying MBMS in a separately deployed 5G system according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings.

For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "comprising" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.

The applicant found that: in the independently deployed 5G system illustrated in fig. 2, how to provide MBMS by MBMS bearer through 5GC and gNB has no relevant implementation manner in the industry at present. The invention provides a method and a system for broadcasting MBMS through 5GC and NR aiming at the scenes, which realize that the MBMS is broadcasted on a gNB through the 5GC in the independently deployed scenes in an MBMS bearing mode. In particular, the present invention continues to use BM-SC and MBMS-GW in the architecture for MBMS bearer broadcast in the 3GPP protocol, so as to implement MBMS broadcast in the gbb via MBMS bearer by 5GC in the above-mentioned independently deployed scenario.

Fig. 3 is a flowchart of a method for loading MBMS in an independently deployed 5G system according to the present invention.

As shown in fig. 3, the method includes:

step 301: the 5GC receives an MBMS session start request from the MBMS-GW.

Here, the MBMS-GW may receive a session start request originating from the GCS AS from the BM-SC and may also receive a session start request originating from a server of another type than the GCS AS from the BM-SC. Typical other types of servers include V2X servers. Then, the MBMS-GW transmits a session start request originated from the GCS AS or other type of server to the 5 GC.

Step 302: the MCE receives an MBMS session start request from the 5GC, determines a cell that needs to broadcast the MBMS and belongs to the gNB.

Step 303: and the MCE determines a broadcast mode of broadcasting the MBMS in the cell belonging to the gNB.

Step 304: and the gNB receives MBMS configuration information corresponding to a broadcast mode from the MCE and receives MBMS data from the MBMS-GW based on the MBMS configuration information.

Step 305: and the gNB broadcasts the MBMS data in the cell belonging to the gNB based on the broadcasting mode.

In one embodiment, the broadcasting means may include: (1) only adopting MBSFN mode; (2) only adopting SC-PTM mode; (3) and adopting MBSFN mode or SC-PTM mode.

Preferably, the SC-PTM scheme includes an SC-PTM scheme of mode 1 and an SC-PTM scheme of mode 2, wherein: in the SC-PTM scheme of scheme 1: in a cell belonging to a gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode; in the SC-PTM scheme of scheme 2: in a cell belonging to a gNB, the MCE determines a cell ID list broadcasting MBMS in an SC-PTM mode and allocates NR parameters for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID to a current MBMS and determines configuration information of a bandwidth part (BWP) broadcasting the MBMS, wherein the configuration information of the BWP includes: the time-frequency position, the subcarrier interval and the CP type of BWP broadcasting MBMS, the search space corresponding to a Physical Downlink Control Channel (PDCCH) scheduling MBMS and the configuration information of a control resource set.

In one embodiment, when the broadcast mode includes an MBSFN mode, the MBMS configuration information includes: a cell ID list for broadcasting MBMS in MBSFN in a cell belonging to the gNB; wireless resource configuration information uniformly allocated for the MBMS; session attributes of MBMS in an MBMS session start request; when the broadcast mode includes the SC-PTM mode of the mode 1, the MBMS configuration information includes: a cell ID list for broadcasting MBMS in SC-PTM mode in the cell belonging to the gNB; session attributes of MBMS in an MBMS session start request; when the broadcast mode comprises the SC-PTM mode of the mode 2, the MBMS configuration information comprises: a cell ID list for broadcasting MBMS in SC-PTM mode in the cell belonging to the gNB; session attributes of MBMS in an MBMS session start request; NR parameters allocated for MBMS, the NR parameters comprising: the MCE allocates a unique group ID for the MBMS; and the MCE determines the configuration information of the BWP broadcasting the MBMS.

In one embodiment, the method further comprises:

5GC receives MBMS conversation updating request from MBMS-GW, and sends the MBMS conversation updating request to MCE; the MCE sends an MBMS session update request to the gNB; and the MCE reallocates the radio resources of the MBMS according to the MBMS session update request in the MBSFN mode, and the gNB reallocates the radio resources of the MBMS according to the MBMS session update request in the SC-PTM mode. Wherein: when the MCE or the gNB successfully reallocates the radio resources, the gNB continuously receives the MBMS data from the MBMS-GW; when the MCE or the gNB fails to reallocate the radio resources, the gNB stops receiving the MBMS data from the MBMS-GW.

Therefore, the embodiment of the invention also realizes the MBMS conversation updating process.

In one embodiment, the method further comprises:

5GC receives MBMS conversation end request from MBMS-GW, and sends the MBMS conversation end request to MCE; the MCE sends an MBMS session ending request to the gNB; the MCE releases MBMS bearing context of the MBMS based on the MBMS conversation end request, releases wireless resources allocated to the MBMS conversation in an MBSFN mode, and feeds back an MBMS conversation end response to the 5 GC; and the gNB releases the wireless resources occupied by the MBMS conversation according to the MBMS conversation ending request, stops receiving the MBMS data from the MBMS-GW and feeds back an MBMS conversation ending response to the MCE.

Therefore, the embodiment of the invention also realizes the MBMS session ending process.

Based on the above description, the embodiment of the present invention further provides a system for independently deployed 5G systems to carry MBMS.

The system comprises 5GC, MCE and gNB, wherein: 5GC for receiving an MBMS session start request from the MBMS-GW; the MCE is used for receiving an MBMS session starting request from the 5GC and determining a cell which needs to broadcast the MBMS and belongs to the gNB; determining a broadcast mode for broadcasting the MBMS in the cell belonging to the gNB; the gNB is used for receiving MBMS configuration information corresponding to a broadcast mode from the MCE and receiving MBMS data from the MBMS-GW based on the MBMS configuration information; and broadcasting the MBMS data in the cell belonging to the gNB based on the broadcasting mode.

In one embodiment, the broadcasting scheme includes: only adopting MBSFN mode; only adopting SC-PTM mode; adopting MBSFN mode or SC-PTM mode.

In one embodiment, the SC-PTM scheme includes an SC-PTM scheme of scheme 1 and an SC-PTM scheme of scheme 2, wherein: in the SC-PTM scheme of scheme 1: in a cell belonging to a gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode; in the SC-PTM scheme of scheme 2: in a cell belonging to a gNB, the MCE determines a cell ID list broadcasting MBMS in an SC-PTM mode and allocates NR parameters for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a BWP broadcasting the MBMS, wherein the configuration information of the BWP comprises: the time-frequency position, the subcarrier interval and the CP type of the BWP broadcasting the MBMS, the search space corresponding to the PDCCH scheduling the MBMS and the configuration information of the control resource set.

In one embodiment, the 5GC is further configured to receive an MBMS session update request from the MBMS-GW, and send the MBMS session update request to the MCE; the MCE is also used for sending the MBMS conversation updating request to the gNB and reallocating the radio resources of the MBMS in the MBSFN mode according to the MBMS conversation updating request; the gNB is also used for reallocating the radio resources of the MBMS according to the MBMS session update request in an SC-PTM mode; when the wireless resource is successfully reallocated, the gNB continues to receive the MBMS data from the MBMS-GW; when the reallocation of radio resources fails, the gNB stops receiving MBMS data from the MBMS-GW.

In one embodiment, the 5GC is further configured to receive an MBMS session end request from the MBMS-GW, and send the MBMS session end request to the MCE; the MCE is also used for sending an MBMS session ending request to the gNB, releasing MBMS bearing context of the MBMS based on the MBMS session ending request, releasing wireless resources occupied by the MBMS session in an MBSFN mode, and feeding back an MBMS session ending response to the 5 GC; and the gNB is also used for releasing the radio resources occupied by the MBMS session based on the MBMS session ending request, feeding back an MBMS session ending response to the MCE and stopping receiving the MBMS data from the MBMS-GW.

In fig. 4, the broadcast of MBMS through 5G NR is implemented by adding an MBMS related function and a logical network element MCE in 5GC, following BM-SC and MBMS-GW in the architecture for broadcast of MBMS carried by MBMS in 3GPP protocol.

In fig. 4, the PLMN is H-PLMN when the UE is in a non-roaming scenario; when the UE is in a roaming scenario, the PLMN is a V-PLMN.

Further, the functions of the network elements in the above architecture of fig. 4 are as follows:

entry (one), GCS AS, BM-SC, and other types of servers:

the GCS AS is connected to the BM-SC via the MB2 interface, through which the BM-SC is requested to set up/update/release MBMS bearers for the specified MBMS.

In the embodiment of the present invention, the function of the GCS AS is not changed, and the user plane and control plane processing procedures performed by the GCS AS and BM-SC through the MB2 interface are not changed.

The BM-SC is connected with other types of servers through an added xMB interface, and typical other types of servers comprise a V2X server. Other types of servers request the BM-SC to establish/update/release MBMS bearers for the specified MBMS over the interface. The user plane and control plane processing procedures performed by other types of servers and BM-SCs via the xMB interface are unchanged.

The embodiment of the invention realizes the function of providing broadcast service for other types of servers in an independently deployed 5G system by introducing other types of servers and xMB interfaces, effectively expands the types and sources of information on MBMS bearing, and expands the application range of the MBMS bearing serving as a pipeline.

Optionally, the GCS AS is connected to the BM-SC via a standard xMB interface, through which the GCS AS requests the BM-SC to establish/update/release MBMS bearers for the specified MBMS.

The function of the xMB interface here is to interface xMB between the BM-SC and other types of servers. Compared with the MB2 interface, the xMB interface provides a strong security function, supports bidirectional authentication between connected network elements, and simultaneously guarantees the security of the control plane and the user plane of the interface. When the interface is used for realizing the connection between the GCS AS and the BM-SC, the GCS AS and the BM-SC are required to add corresponding functions to support the connection through a standard xMB interface. The GCS AS and BM-SC need new functions for supporting the interface, so that the safety of control plane information and user plane information between the GCS AS and the BM-SC is improved.

Entry (two), MBMS-GW:

BM-SC connects with MBMS-GW through SGmb interface and SGimb interface. BM-SC initiates the processes of MBMS conversation start, conversation end and conversation updating process through SGmb interface, and triggers the downstream network element to execute corresponding processing. Here, the downstream network element includes: MBMS-GW, AMF, MCE and gNB.

In the process of starting the session, the BM-SC sends a session starting request to the MBMS-GW through the SGmb interface, triggers each network element at the downstream to establish an MBMS bearing context for the MBMS session, and allocates corresponding resources for the MBMS bearing. Specifically, MBMS-GW allocates TNL resources for the session, MCE determines each MCE corresponding to the MBMS broadcast area, sends a session request to each MCE, MCE selects a session sending mode and allocates radio resources for the session sent in the MBSFN mode in a unified manner, and gNB allocates radio resources for the session sent in the SC-PTM mode in a corresponding cell.

In the process of ending the session, the BM-SC sends a session ending request to the MBMS-GW through the SGmb interface, triggers each downstream network element to delete the MBMS bearer context corresponding to the MBMS session, and releases corresponding resources allocated for the corresponding MBMS bearer. Specifically, MBMS-GW releases TNL resources allocated for the session, MCE releases radio resources occupied by the session transmitted in MBSFN mode, and gNB releases radio resources occupied by the session transmitted in SC-PTM mode or MBSFN mode in corresponding cell.

In the process of session updating, BM-SC sends a session updating request to MBMS-GW through SGmb interface, triggers each network element at the downstream to update MBMS bearing context for MBMS session, and reallocates corresponding resources for MBMS bearing. For example, when ARP is updated in the QOS message of the session, the MCE and the gNB reallocate radio resources for the session transmitted in the MBSFN manner and the SC-PTM manner, respectively.

Since both the LTE system and the 3G system support MBMS bearer broadcast, the BM-SC carries an Access indicator (Access indicator) to the MBMS-GW in the corresponding message in the MBMS session start procedure and the session update procedure. The Access indicator indicates: RAT adopted for MBMS. The current value of this IE may be: UTRAN, E-UTRAN, or BOTH, respectively, instructing the corresponding MBMS to be transmitted only through UTRAN, only through E-UTRAN, and simultaneously through UTRAN and E-UTRAN. Currently, the MBMS-GW filters the nodes in the list of control plane nodes in the same message according to the IE in the corresponding message, and removes the corresponding nodes from the list when the corresponding nodes do not conform to the RAT indicated by the IE. And when the IE value is E-UTRAN, the control plane node list after MBMS-GW filtering is an MME list. The MBMS-GW sends an MBMS session start request to each MME indicated by the list.

In the embodiment of the present invention, in order to support the MBMS broadcast in the cell corresponding to the gNB, the Access indicator adds 1, 2, or 3 values among the following three possible values.

(1)5G NR: MBMS uses only 5G NR transmission;

(2) BOTH E-UTRAN and 5G NR: MBMS adopts E-UTRAN and 5G NR transmission at the same time;

(3) ALL: MBMS employs UTRAN, E-UTRAN and 5G NR transmission simultaneously.

When the RAT used by the MBMS includes 5G NR, the BM-SC needs to set the Access indicator as a corresponding value in the newly added values in the messages sent in the MBMS session start process and the session update process according to specific conditions. Such as: when only 5G NR is adopted, the BM-SC sets the value of the Access indicator as follows: 5G NR.

The MBMS-GW needs to identify a new value of the Access indicator in the received corresponding message, and the MBMS-GW needs to filter nodes in a control plane node list in the corresponding message according to the new value of the Access indicator. Specifically, the MBMS-GW supports the following new processing:

when the IE value is "5G NR", nodes that do not support 5G NR are filtered out of the control plane node list, such as: an SGSN node;

when the IE has a value of "BOTH E-UTRAN and 5G NR", nodes that do not support either 5G NR or E-UTRAN are filtered out from the list of control plane nodes, such as: and an SGSN node.

When the value of IE is 'UTRAN, E-UTRAN and 5G NR', filtering out the nodes which do not support any RAT of UTRAN, E-UTRAN and 5G NR from the control plane node list;

in order to make the 5GC capable of providing MBMS, the MBMS-GW needs to support the following additional interfaces: (1) and adding an Sm interface with the 5GC, wherein the function of the Sm interface is the same as that of the Sm interface between the MBMS-GW and the MME.

In order to make the 5GC capable of providing MBMS, the MBMS-GW needs to support the following additional functions:

(1) the control plane information is transmitted to the 5GC through the Sm interface, and the control plane information fed back by the 5GC is received through the Sm interface.

Entry (three), 5 GC:

in order for the g-NB to broadcast MBMS, 5GC is required to support the following new interfaces:

(1) and an Sm interface with the MBMS-GW is newly added, and the function of the interface is the same as the Sm interface between the MBMS-GW and the MME.

(2) And adding an M3 interface of the newly added logic network element MCE, wherein the function of the interface is the same as that of an M3 interface between the MME and the MCE in the EPC.

In order for the g-NB to broadcast MBMS, the 5GC is required to support the following additional functions:

(1) and 5GC receives the control plane information sent by the MBMS-GW through the Sm interface and feeds back the corresponding control plane information through the Sm interface.

(2) The 5GC sends the control plane information to the MCE through an M3 interface, and receives the control plane information fed back by the MCE through the interface.

Preferably, the newly added Sm interface is an interface between the AMF and the MBMS-GW in the 5GC, and the newly added M3 interface is an interface between the AMF and the MCE. The AMF needs to add corresponding functions in the processes of MBMS session start, MBMS session end and MBMS session update.

In the above items (two) and (three), the control plane information of the Sm interface includes the related signaling transmitted through the Sm interface in the MBMS session start procedure, the MBMS session update procedure, and the MBMS session end procedure. The control plane information of the M3 interface also includes related signaling transmitted through the M3 interface during the MBMS session start procedure, the MBMS session update procedure, and the MBMS session end procedure.

Item (iv), add new logical network element MCE:

in order to be able to transmit MBMS in the cells belonging to the gNB in MBSFN, a new logical network element MCE is required. The MCE needs to support the following interfaces with other network elements:

(1) interface M3 between MCE and 5gc (amf);

(2) m2 interface between MCE and gNB.

Furthermore, the MCE needs to support the following functions: (1) interworking control plane signaling with 5gc (amf) over M3 interface; (2) interacting control plane signaling with the gNB through an M2 interface; (3) in the MBSFN mode, uniformly distributing wireless resources required by MBMS bearing to a 5G NR cell; (4) in the SC-PTM mode, 5G NR parameter sets are allocated to the 5G NR cells, so that the gNB can conveniently schedule corresponding radio resources in the corresponding 5G NR cells according to the parameter sets for bearing and broadcasting data of the MBMS through the MBMS.

Entry (five), gNB:

for the gNB to broadcast MBMS, the gNB needs to support the following interfaces: (1) an M2 interface between the gNB and the MCE; (2) m1 interface between the gNB and MBMS-GW.

For the gNB to broadcast MBMS, the gNB needs to add the following functions: (1) and supporting a newly added interface: m2 and M1; (2) broadcasting MBMS in the 5G NR cell in an MBSFN manner; (3) and allocating radio resources for the MBMS transmitted in the SC-PTM mode in the 5G NR cell based on the radio resource allocation parameter set, and broadcasting the MBMS in the SC-PTM mode on the corresponding radio resources.

In the embodiment of the invention, the GCS AS and BM-SC adopt the existing processing method on the MB2 interface; the processing of other types of servers and BM-SC on xMB interface adopts the existing processing method; when a standard xMB interface is introduced between the GCS AS and the BM-SC, the system and the method of the invention have no influence on a xMB interface of the standard, although the GCS AS and the BM-SC are required to add corresponding functions to realize connection through the xMB interface of the standard.

In summary, in the embodiment of the present invention, the processing between the GCS AS and the BM-SC at the MB2 interface, the processing between the BM-SC and the other type of server at the xMB interface, and the processing between the GCS AS and the BM-SC at the xMB interface need not be described in detail.

In the above description of the method and system, the processing that the MCE should perform as an independent logical network element is described in detail. Indeed, the MCE may be merged with the corresponding AMF into an enhanced AMF (m-AMF) or with the corresponding gNB into an enhanced gNB (m-gNB), as desired.

The functions of MCE are realized directly by AMF in M-AMF, and M3 interface is no longer existed as internal interface. Specifically, the m-AMF implements the following functions: (1) interacting a control plane signaling with the MBMS-GW through an Sm interface; (2) interacting control plane signaling with the gNB through an M2 interface; (3) determining the mode of transmitting the MBMS session in the MBMS area or the cell: an MBSFN mode or an SC-PTM mode, wherein when the MBMS conversation is sent by adopting the MBSFN mode, radio resources are uniformly allocated to the MBMS conversation in a service area or an area formed by a plurality of cells; when an SC-PTM mode is adopted to send the MBMS conversation, 5G NR parameters are distributed for the conversation; (4) and determining each gNB corresponding to the MBMS area ID list or the cell ID list, and interacting information with the corresponding gNB through an M2 interface.

In the M-gNB, the M-gNB realizes the functions of the MCE, and the M2 interface no longer exists as an internal interface. The m-gNB can realize the following functions:

(1) interacting control plane signaling with 5gc (amf) through M3 interface;

(2) determining the mode of transmitting the MBMS session in the MBMS area or the cell: an MBSFN mode or an SC-PTM mode, wherein when the MBMS conversation is sent by adopting the MBSFN mode, radio resources are uniformly allocated to the MBMS conversation in a service area or an area formed by a plurality of cells; when an SC-PTM mode is adopted to send an MBMS conversation, the gNB firstly allocates 5G NR parameters for the conversation and then allocates wireless resources to the conversation in each 5G NR cell for sending the conversation based on the 5G NR parameters;

(3) joining the corresponding IP multicast distribution through the M1 interface;

(4) and broadcasting the data of the MBMS in the corresponding 5G NR cell in an MBSFN mode or an SC-PTM mode through the corresponding radio resource.

Fig. 5 is a structural diagram of an apparatus for carrying MBMS in a non-independently deployed 5G system according to the present invention.

As shown in fig. 5, the apparatus includes: a processor 501 and a memory 502; in which a memory 502 has stored therein an application executable by the processor 501 for causing the processor 501 to perform a method of MBMS-bearing for a separately deployed 5G system as described in any one of the above.

The memory 502 may be embodied as various storage media such as an Electrically Erasable Programmable Read Only Memory (EEPROM), a Flash memory (Flash memory), and a Programmable Read Only Memory (PROM). The processor 501 may be implemented to include one or more central processors or one or more field programmable gate arrays that integrate one or more central processor cores. In particular, the central Processor or central Processor core may be implemented as a CPU or MCU or Digital Signal Processor (DSP), or the like.

It should be noted that not all steps and modules in the above flows and structures are necessary, and some steps or modules may be omitted according to actual needs. The execution sequence of the steps is not fixed and can be adjusted according to the needs. The division of each module is only for convenience of describing adopted functional division, and in actual implementation, one module may be divided into multiple modules, and the functions of multiple modules may also be implemented by the same module, and these modules may be located in the same device or in different devices.

The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (e.g., a special purpose processor such as an FPGA or ASIC) for performing specific operations. A hardware module may also include programmable logic devices or circuits (e.g., including a general-purpose processor or other programmable processor) that are temporarily configured by software to perform certain operations. The implementation of the hardware module in a mechanical manner, or in a dedicated permanent circuit, or in a temporarily configured circuit (e.g., configured by software), may be determined based on cost and time considerations.

The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method as described herein. Specifically, a system or an apparatus equipped with a storage medium on which software program codes that realize the functions of any of the embodiments described above are stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program codes stored in the storage medium. Further, part or all of the actual operations may be performed by an operating system or the like operating on the computer by instructions based on the program code. The functions of any of the above-described embodiments may also be implemented by writing the program code read out from the storage medium to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causing a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on the instructions of the program code.

Examples of the storage medium for supplying the program code include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD + RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer or the cloud by a communication network.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings are only schematic representations of the relevant parts of the invention, and do not represent the actual structure of the product. Moreover, in the interest of brevity and understanding, only one of the components having the same structure or function is illustrated schematically or designated in some of the drawings. In this document, "a" does not mean that the number of the relevant portions of the present invention is limited to "only one", and "a" does not mean that the number of the relevant portions of the present invention is excluded from "more than one". In this document, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for bearing MBMS by independently deployed 5G system is characterized by comprising the following steps:

5GC receiving an MBMS session start request from a multimedia broadcast multicast service-gateway MBMS-GW;

a multi-cell multicast coordination entity MCE receives an MBMS session starting request from a 5GC and determines a cell which needs to broadcast MBMS and belongs to a gNB;

the gNB broadcasts the MBMS data in the cell belonging to the gNB based on the broadcasting mode;

the broadcasting mode comprises the following steps:

only adopting a multimedia broadcast multicast single frequency network MBSFN mode;

only adopting a single-cell point-to-multipoint SC-PTM mode;

adopting MBSFN mode or SC-PTM mode.

2. The method according to claim 1, wherein the SC-PTM scheme comprises an SC-PTM scheme of mode 1 and an SC-PTM scheme of mode 2, wherein:

in the SC-PTM scheme of scheme 2: in a cell belonging to a gNB, the MCE determines a cell ID list broadcasting MBMS in an SC-PTM mode and allocates NR parameters for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a bandwidth part BWP broadcasting the MBMS, wherein the configuration information of the BWP includes: the time-frequency position, the subcarrier interval and the CP type of BWP broadcasting MBMS, the search space corresponding to a physical downlink control channel PDCCH dispatching MBMS and the configuration information of a control resource set.

3. The method of claim 2,

when the broadcast mode includes the MBSFN mode, the MBMS configuration information includes: a cell ID list for broadcasting MBMS in MBSFN in a cell belonging to the gNB; wireless resource configuration information uniformly allocated for the MBMS; session attributes of MBMS in an MBMS session start request;

when the broadcast mode includes the SC-PTM mode of mode 2, the MBMS configuration information includes: a cell ID list for broadcasting MBMS in SC-PTM mode in the cell belonging to the gNB; session attributes of MBMS in an MBMS session start request; NR parameters allocated for MBMS, the NR parameters comprising: the MCE distributes a unique group ID for the MBMS; and the MCE determines the configuration information of the BWP broadcasting the MBMS.

4. The method of claim 1, further comprising:

5GC receives the MBMS conversation updating request from the MBMS-GW and sends the MBMS conversation updating request to the MCE; the MCE sends the MBMS session updating request to the gNB;

the MCE reallocates the radio resources of the MBMS according to the MBMS session updating request in the MBSFN mode, and the gNB reallocates the radio resources of the MBMS according to the MBMS session updating request in the SC-PTM mode, wherein when the reallocation of the radio resources is successful, the gNB continues to receive MBMS data from the MBMS-GW; when the reallocation of radio resources fails, the gNB stops receiving MBMS data from the MBMS-GW.

5. The method of claim 1, further comprising:

6. A system for bearing MBMS by an independently deployed 5G system is characterized by comprising a 5GC, an MCE and a gNB, wherein:

the 5GC is used for receiving an MBMS session starting request from a multimedia broadcast multicast service-gateway MBMS-GW;

the gNB is used for receiving MBMS configuration information corresponding to a broadcast mode from the MCE and receiving MBMS data from the MBMS-GW based on the MBMS configuration information; broadcasting the MBMS data in the cell belonging to the gNB based on the broadcasting mode;

the broadcasting mode comprises the following steps:

only adopting a single-cell point-to-multipoint SC-PTM mode;

and adopting an MBSFN mode or an SC-PTM mode.

7. The system of claim 6,

the SC-PTM mode comprises an SC-PTM mode of a mode 1 and an SC-PTM mode of a mode 2, wherein:

in the SC-PTM scheme of scheme 2: in a cell belonging to a gNB, the MCE determines a cell ID list for broadcasting MBMS in an SC-PTM mode and allocates an NR parameter for the MBMS; the allocating, by the MCE, the NR parameter for the MBMS includes: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a bandwidth part BWP broadcasting the MBMS, wherein the configuration information of the BWP comprises: the time frequency position, the subcarrier interval and the CP type of the BWP of the bandwidth part of the broadcast MBMS, the search space corresponding to the PDCCH of the physical downlink control channel for scheduling the MBMS and the configuration information of the control resource set.

8. The system of claim 7,

9. The system of claim 6,

5GC, also used for receiving MBMS conversation updating request from MBMS-GW, sending the MBMS conversation updating request to MCE;

the gNB is further configured to reallocate the radio resources of the MBMS according to the MBMS session update request in the SC-PTM manner, and continue to receive MBMS data from the MBMS-GW when the reallocation of the radio resources is successful; when the reallocation of the radio resources fails, the reception of the MBMS data from the MBMS-GW is stopped.

10. The system of claim 6,

5GC, also used for receiving MBMS conversation end request from MBMS GW, sending the MBMS conversation end request to MCE;

11. An apparatus for carrying MBMS in an independently deployed 5G system, comprising a processor and a memory;

the memory has stored therein an application executable by the processor for causing the processor to perform the method of MBMS-bearing for an independently deployed 5G system of any of claims 1 to 5.

12. A computer readable storage medium having stored therein computer readable instructions for performing the method of MBMS-bearing for an independently deployed 5G system of any of claims 1 to 5.